 The Finnish ENA, Koronavilku, was one of the national ENAs with the highest proportion of users during the COVID-19 pandemic, prioritizing privacy and data security for end users, limiting its use as a tool for healthcare professionals and deeper insight into its potential effectiveness. The app was designed to supplement conventional contact tracing and serve as an early warning system, achieving a predefined target of 40% uptake in the population within three months of launch. However, automatization could have more effectively saved resources in healthcare services and prevented overburdening contact tracing teams if added earlier and comprehensively. The number of active apps gradually declined as quarantine and testing practices for a symptomatic vaccinated individuals following exposure to the virus were eased and home tests became more common, eventually replacing laboratory testing for much of the population. A self-service option for token issuance would have prolonged the lifespan of the app. Regularly conducted surveys could have helped gain timely knowledge on the use and effectiveness of the app for better responding to the changing needs during the pandemic. This article was authored by Mika Palajomaki, Sarah Wickstrom, Kaya Purinen, and others. We are article.tv, links in the description below.